Modern people, whether in life or work, will be exposed to a variety of equipment to protect life and property safety. For example, smoke and carbon monoxide alarm, fire alarm and sprinkler system, anti-theft alarm, video monitoring and access control system are common equipment in offices, schools, hospitals, factories and even families. With the rise of Internet of things (IOT) technology, the concepts of smart home and smart building have gradually become popular; Therefore, a series of smart sensing devices composed of simple electronic devices can easily access to the Internet and cloud. Most of these smart devices can be remotely controlled through smart phones and other device apps running IOS or Android systems.

Technological innovation in the field of intelligent buildings is changing with each passing day. Many innovative emerging companies are constantly challenging traditional industries, which brings happiness and trouble to consumers' choices, affecting from personal DIY to high-end family security systems. Products of companies such as hive and nest can make smart home systems "plug and play", while products such as Amazon's Alexa and Google's assistant can also conduct human-computer interaction to realize remote control of devices.

In such a rapidly changing market, especially in the field closely related to people's life, laws, regulations and industry standards are very important, because they can ensure that these products can work correctly according to people's requirements. In Europe, the CE certification mark on the product means that the product meets the relevant health, safety and environmental protection standards of all CE requirements, and all products produced or sold in the European market must be marked with the CE certification mark. The process of obtaining CE certification mark is very complex and needs to accept various strict design verification and testing; Therefore, when designing their products, security systems companies need to carefully select appropriate accessories and supplier partners, which is very important for their products to successfully pass CE certification in the future.

Because the certification standard is applicable not only to the system itself, but also to its accessories, such as switches, which play a series of important roles in the whole field of security products. For example, each smoke alarm must be equipped with a detection / reset switch, which must ensure reliable operation throughout the life cycle of the detector, regardless of the service environment of the detector. Networking devices in intelligent buildings usually use dial switches to configure the address of the device in the whole network. There are also many security products, such as control panel, outdoor lighting and alarm, motion sensor and door and window sensor, which use button switches as tamper protection.

The application requirements of this switch will vary according to the mechanical structure or environmental requirements of the equipment, but they are basically metal switches, touch switches and waterproof button switches.

These switches need to work under various harsh conditions. The regulations of some countries, including the whole Europe, require the switches to work normally in corrosive gases (such as sulfur dioxide). International standards for alarm and security system, including electronic access control, alarm transmission, video monitoring, fire detection and fire alarm system, are defined as TC 79 by ice. TC 79 standard also covers the unified communication between these different devices. As the number of IOT networking devices increases, they are also included in TC 79 standard.